Jacob edson



JACOB EDSON, OF BOSTON, MASSACHUSETTS.

PUMP.

Specification of Letters Patent No. 26,025, dated November 8, 1859.

To all whom it may concern:

Be it known that I, Jnco EDsoN, of Boston, in the county of Suffolk andState of Massachusetts, have invented certain new and usefulImprovements in Force and Lift Pumps, of which the following is a full,clear, and exact description, reference being had to the accompanyingdrawings, making part of this specification, in whichd Figure l, is avertical section through my pump; Fig. 2, a horizontal section upon theline y, y of Fig. l; Fig. 3, a plan of the movable box or plunger; Fig.4L, a plan of the valve o, of Fig. l; Fig. 5, a view of the springcylinder g. Fig. 6 will be referred to hereafter.

To enable others skilled in the art to understand my invention, I willproceed to describe the manner in which I have carried it out.

In the accompanying drawings, A, is the body of the pump, down throughthe center of which descends the tube B, which steadies and guides thepiston rod C, and descends so low as to enter the water in the airchamber that any leak around the piston may not empty the air from theair chamber. The piston rod is packed by the cap D in the customarymanner.

E, is the movable boX or plunger through the openings a, in which thewater passes from the cylinder to the air chamber G. The openings a, areclosed by the circular disk valve b, which plays up and down upon therod C as the latter is operated. A difliculty has heretofore beenexperienced with valves of this description arising from theintroduction of sand and grit at the point c, between the valve andpiston rod, to remedy which evil I employ a cylinder of india rubber g,which surrounds the piston rod, and bears at its upper end upon theshoulder h. The lower end of this cylinder rests upon the valve andholds it down upon its seat at the same time that it firmly grasps theflange f, and thus prevents the admission of sand and grit at the pointc, as before stated. In pumps of this character where the stroke isshort some time is lost after the plunger commences to rise before thevalve falls upon its seat. This is measurably corrected by the spring ofthe tube g, which forces the plate down upon its seat so soon as theplunger commences to rise.

Efforts have been made to do away with the water hammer in pumps of thisclass,

but thus far without ventire success. Vhere an air chamber has beenplaced upon the induction pipe the difiiculty has only been partiallyremedied owing to the smallness of the passages from such air chambersto the induction pipe and from the latter' to the pump cylinder.

The second part of my invention has for its object the removal of thisdifficulty and consists in the peculiar' manner in which I havesurrounded the pump cylinder with a vacuum chamber or fountain H, thebottom of the cylinder resting upon flanges, whereby a free passage isprovided from the induction pipe to the vacuum chamber or fountainthrough which the water is permitted to flow freely in and out withoutobstruction and an easy motion of the plunger is thereby secured. Thispart of my invention will now be described. The pump cylinder I, whichis of drawn yellow metal or other suitable composition, is passedthrough an opening in the partition or division plate K, the jointbetween the two being secured by molten metal. The cylinder is allowedto project slightly above the plate K, that there may always be astratum of water retained above the plate, by which means the joint atz', is further secured by the rust which forms at this point. The bottomof the cylinder is forced down upon the flanges L, upon the inclinedsurfaces of which it adjusts itself and by which it is held in position.An abundant passage way is thus afforded between the flanges L andbeneath the bottom of the cylinder for the water in and out of thechamber, as before described. A vacuum chamber thus arranged isparticularly applicable to a pump of short stroke, as it acts as afountain to supply the pump readily with water, and enables me to employa smaller induction pipe than could otherwise advantageously be used.Then the induction pipe is secured to the body of the pump by means of aflange and clamp, if the screw which confines the clamp to the pump bebrought down unequally one side of the flange is liable to be sprung offfrom the pump and the joint is not tight.

To remedy this is the object of the third part of my invention, whichconsists in the use of two bearing points which project from oppositesides of the clamp and bear upon opposite sides of the flange; thesepoints are seen at m, Fig. 6, which represents a plan and side view ofthe clamp ioo which secures the induction pipe to the pump. If now anunequal strain be put upon either of the screws S, the clamp is allowedto pivot upon the points m, and the induction pipe is thus enabled toadjust itself to its seat.

T, is a plug by means of which the pump may be changed from a lift to aforce pump.

U, is a basin through which water may at any time be introduced to startthe pump.

What I claim as my invention and desire to secure by Letters Patent isl.The peculiar manner in which I support the cylinder upon the flanges L,in combination with the vacuum chamber H for the purpose of insuring anunobstructed passage between the said chamber and the induction pipebelow the valves in the manchamber as set forth.

JACOB EDSON. lVitnesses:

SAM. COOPER, P. E. TEsoI-IEMACHER.

